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通过对鄂尔多斯盆地张家湾地区延长组8段的岩心分析、薄片鉴定、压汞测试等研究,认为该区长8段主要发育三角洲前缘水下分流河道、河道间湾沉积微相,砂体多呈条带状展布,岩性为细粒级别长石砂岩。物性分析表明,研究区主要为特低孔、超低渗、特小孔道、细微喉型储层。按物性及与含油气关系可将储层分为4类:Ⅰ、Ⅱ类为物性相对较好的储层,Ⅲ类仍具一定开发价值,Ⅳ类几乎无油气显示。根据储层分类评价标准及含油气特征,预测有利区主要位于研究区西北部。
Based on the core analysis, thin-section identification and mercury intrusion test of section 8 of Yanchang Formation in Zhangjiawan area, Ordos Basin, it is concluded that the main section of the 8th section of the Changjiang fault zone is mainly composed of delta front distributary channel, inter-bay sedimentary microfacies, sand body Mostly strip distribution, lithology of fine-grained feldspar sandstone. Physical property analysis shows that the study area is mainly ultra-low porosity, ultra-low permeability, ultra-small pore channels and fine throat-type reservoirs. Reservoirs can be divided into four types according to their physical properties and their relationship to oil and gas: reservoirs of type I and II are relatively good in physical properties, type III still has certain development value, and type IV shows almost no oil and gas. According to reservoir classification evaluation criteria and oil-gas characteristics, the favorable areas are mainly located in the northwestern part of the study area.